code: def get_mem_data():
      vmem = psutil.virtual_memory()
      df = pd.DataFrame(
          dict(
              free=vmem.free / vmem.total, used=vmem.used / vmem.total
          ),
          index=[pd.Timestamp.now()],
      )
      return df * 100
  
file_path: holoviews/examples/gallery/apps/bokeh/streaming_psutil.py
imports: import psutil
  import panel
  import pandas
  import holoviews
  from holoviews import dim, opts
label_desc: Use image node_id 1 for calling a global function with example usage: get_mem_data() and returns: unknown